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134 .\" ========================================================================
136 .IX Title "SSL_connect 3"
137 .TH SSL_connect 3 "2003-06-03" "1.1.0-dev" "OpenSSL"
138 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
139 .\" way too many mistakes in technical documents.
143 SSL_connect \- initiate the TLS/SSL handshake with an TLS/SSL server
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/ssl.h>
151 \& int SSL_connect(SSL *ssl);
154 .IX Header "DESCRIPTION"
155 \&\fISSL_connect()\fR initiates the \s-1TLS/SSL\s0 handshake with a server. The communication
156 channel must already have been set and assigned to the \fBssl\fR by setting an
157 underlying \fB\s-1BIO\s0\fR.
160 The behaviour of \fISSL_connect()\fR depends on the underlying \s-1BIO\s0.
162 If the underlying \s-1BIO\s0 is \fBblocking\fR, \fISSL_connect()\fR will only return once the
163 handshake has been finished or an error occurred.
165 If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fISSL_connect()\fR will also return
166 when the underlying \s-1BIO\s0 could not satisfy the needs of \fISSL_connect()\fR
167 to continue the handshake, indicating the problem by the return value \-1.
168 In this case a call to \fISSL_get_error()\fR with the
169 return value of \fISSL_connect()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
170 \&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. The calling process then must repeat the call after
171 taking appropriate action to satisfy the needs of \fISSL_connect()\fR.
172 The action depends on the underlying \s-1BIO\s0. When using a non-blocking socket,
173 nothing is to be done, but \fIselect()\fR can be used to check for the required
174 condition. When using a buffering \s-1BIO\s0, like a \s-1BIO\s0 pair, data must be written
175 into or retrieved out of the \s-1BIO\s0 before being able to continue.
177 .IX Header "RETURN VALUES"
178 The following return values can occur:
180 The \s-1TLS/SSL\s0 handshake was successfully completed, a \s-1TLS/SSL\s0 connection has been
183 The \s-1TLS/SSL\s0 handshake was not successful but was shut down controlled and
184 by the specifications of the \s-1TLS/SSL\s0 protocol. Call \fISSL_get_error()\fR with the
185 return value \fBret\fR to find out the reason.
189 The \s-1TLS/SSL\s0 handshake was not successful, because a fatal error occurred either
190 at the protocol level or a connection failure occurred. The shutdown was
191 not clean. It can also occur of action is need to continue the operation
192 for non-blocking BIOs. Call \fISSL_get_error()\fR with the return value \fBret\fR
193 to find out the reason.
195 .IX Header "SEE ALSO"
196 \&\fISSL_get_error\fR\|(3), \fISSL_accept\fR\|(3),
197 \&\fISSL_shutdown\fR\|(3), \fIssl\fR\|(3), \fIopenssl_bio\fR\|(3),
198 \&\fISSL_set_connect_state\fR\|(3),
199 \&\fISSL_do_handshake\fR\|(3),
200 \&\fISSL_CTX_new\fR\|(3)
202 .IX Header "POD ERRORS"
203 Hey! \fBThe above document had some coding errors, which are explained below:\fR
204 .IP "Around line 49:" 4
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206 You have '=item 0' instead of the expected '=item 2'
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